도마운동 유리첸코 몸 펴 공중돌기 동작의 운동학적 분석

윤창선,김태삼,윤희중,Yoon, Chang-Sun,Kim, Tae-Sam,Yoon, Hee-Joung 한국운동역학회 2003 한국운동역학회지 Vol.13 No.3

The purpose of this study is to investigate the effective skill motion through the kinematic analysis of the Yurchenko Streched motion in new horse vaulting. The subjects in this study were 3 male gymnasts who were ranked as national athletes. After the 3D motion analysis, kinematic variables were analyzed to comparison with the difference between this study and the previous study(Yang, D. Y and Lee, C. S, 1999). As a result, the following conclusions was drawn; 1. In the board contact phase, this study showed a shorten contact time to maintain in condition highly extension of hip and hee angle than the previous study. 2. In the pre-flight phase, this study appeared more shortly flight duration time and horizontal flight displacement than the previous study. 3. In the horse contact phase, the contact duration time and horizontal displacement of COG shortened than the previous study, but appeared to the fast horizontal and vertical velocity and highly extension of shoulder an. 4. In the post-flight phase, a stable horse contact appeared to the increase of the flight duration time and the apex height during the post-flight. And it showed that these results have a stable and good landing.

RFID 기술을 이용한 실내 위치 추적

윤창선,김태인,김현진,홍연찬,Yoon, Chang-sun,Kim, Tae-in,Kim, Hyeon-jin,Hong, Yeon-chan 한국정보통신학회 2016 한국정보통신학회논문지 Vol.20 No.1

RFID 기술은 리더와 태그( Tag)라는 장치를 이용하여 정보를 인식하는 기술로 현재 대중교통 및 고속도로 하이패스 등에 사용되고 있다. 본 논문에서는 RFID 기술을 응용해 실내에서 물체의 위치를 추적하는 시스템을 설계하고자 한다. 대표적인 위치추적 시스템인 GPS는 비가 오거나 실내 공간 또는 지하에서는 효율이 좋지 않고 오차가 커지는 단점이 있다. 제안된 RFID 실험은 실내에서 배치된 물체의 이동에 따른 신호의 변화를 시뮬레이션 하고 실제 실험과 비교하여 위치추적에 필요한 데이터를 산출한 후 그 데이터를 근거로 이동경로와 오차를 분석하여 향후 추적시스템에 필요한 자료를 제공한다. 위치 추적에 필요한 시뮬레이션은 실제 물체의 이동 경로를 분석하여 수행하였고 실제 실험에서는 RFID 기술을 이용하여 실내 곳곳에 리더를 설치한 환경에서 위치를 알고자 하는 물체에 태그를 장착시키고 이동시킨 후 실험 장비에서 얻어낸 데이터를 분석하였다. 본 논문에서는 획득한 데이터를 분석하여 향후 실내 위치 추적이 필요한 시스템에 활용될 수 있도록 관련 분석값을 제시하였다. RFID를 통한 위치 파악 데이터는 위치에 따른 태그 판별 결과를 보여주며 분석된 데이터는 추후 실내 위치 파악 연구에 활용될 것으로 기대된다. RFID technology is a technology perceiving information with the device called reader and tag which is now used in public transportation such as Hi-pass. In this paper, we design a system which tracks indoor location using this technology. GPS, the most frequently used location-tracking system, has a defect that its accuracy decreases when the device is indoor. In suggested experiment, we simulate signals according to the moving of located objects, then compare with the result of the experiment. Based on the extracted data, we inform data which is for the purpose of tracking system based on analysis of the route and errors. Simulations for the tracking were performed with relocation of real objects. In the real experiment, we arrange the readers around the room and move the tagged object that we like to know the location, then analyze the data from the equipment. This paper suggests the analyzed data for the future indoor tag tracking applications. We expect that the RFID based location positioning data will be used for other indoor positioning research and development.

도마 Yurchenko 몸 펴 공중돌기 동작의 운동학적 분석

윤창선(Yoon Chang-Sun),민아영(Min A-Young) 한국체육과학회 2011 한국체육과학회지 Vol.20 No.1

The purpose of this study is to investigate effects of kinematical variables performed from Yurchenko Stretched skill in horse vaulting. Four national woman gymnasts participated in this study, and four PD-150 video cameras were used to capture motions for three dimensional analysis. The conclusions are as followings: The CoG height of S2 is higher than S1 in post flight phase by means of increasing horizontal velocity at touching board and vertical velocity at taking off board. Those make stable landing postures. The rapid horizontal velocity of S4 both at peak and at landing make unstable landing postures. The vertical velocity of S2 (2.28 ㎧) is much faster than that of S4 (1.36 ㎧) when they take off board. That is an important factor that decides successful motions. Also CoG of S4 is low as she moves to forward direction with scapular angle of S4 not full extending. S1 and S4 have pertinent blockings doing arm into flexion and extension compared to S2 and S3.Trunk angles of S1 and S4 at taking off board are greater than S2 and S3. That make their bodies approaching the horse too closely, and then they can't control themselves. Therefore, they can't move vertical motions. At touching down board, S1 and S4 contacted board with knee joint angle moving flexion, and at taking off board, they take off the board with knee joint angle moving extension. But, S1 suffers difficulty on vertical rise motion because S1 don't extend knee joint completely compared to other subjects.

TlGaxIn₁_xSe₂ Solid Solution의 광학적 특성 및 상전이에 관한 연구

윤창선(Chang Sun Yoon),김병호(Byong Ho Kim),차덕준(Duk Joon Cha) 한국진공학회(ASCT) 1993 Applied Science and Convergence Technology Vol.2 No.2

Bridgman 방법으로 성장된 TlGa_xIn_(1-x)Se₂ 단결정의 격자상수와 energy gap의 성분의존성을 조사하였다. TlGa_xIn_(1-x)Se₂ solid solution의 불연속 특성이 tetragonal과 monoclinic 구조를 가진 0.25<X <0.65의 성분영역에서 일어났으며, tetragonal 구조 (0.0≤X≤0.25)로부터 monoclinic 구조(0.65≤X≤1.0)로 변하는 구조적 상전이가 이 성분영역에서 관측되었다. TlGaSe₂ 단결정의 energy gap과 유전상수의 온도의존성으로부터 각각 1차 및 2차 상전이에 상당하는 107K와 120K에서 변칙특성을 발견하였다. An investigation was made of the dependences of the lattice constants and the energy gap on the composition of TlGa_xIn_(1-x)Se₂ single crystals grown by Bridgman method. It was found that a discontinuity in TlGa_xIn_(1-x)Se₂ solid solutions occurred in the composition range 0.25<X<0.65 with both tetragonal and monoclinic structure. Consequently, the structural phase transition from the tetragonal structure (0.0≤X≤0.25) to the monoclinic structure (0.65≤X≤1.0) was observed in this composition range. The temperature dependences of the energy gap and the dielectric constant in TlGaSe₂ single crystal have shown that the anomalies appeared at 107K and 120K corresponding to first-order and second-order phase transitions, respectively.

아코피안 동작의 오류 진단과 교정

윤창선(Yoon Chang-Sun),하종규(Hah Chong-Ku) 한국체육과학회 2008 한국체육과학회지 Vol.17 No.2

The purpose of this study was to inform a national gymnast, YTY who had trained error motions and correction methods of Akopian motion in Vault for improving competitive performance for 15th Asian Games. For this study, YTY‘'s Akopian motions had been diagnosed from 1st picking out-game, after his motion was corrected by means of information on correcting error motions. and then, it were diagnosed from 2nd picking out-game with 3D image analysis. Two digital video cameras (Sony PD-150) used to capture images for 3D analysis. The results were as following; ① Supporting body-angle was small during board contact phase because the horizontal and vertical velocities of CoG was increased at taking off board and the shortening aerial time during pre-flight phase made touching vault rapid. ② Making supporting body-angle large increased the horizontal and vertical velocities of CoG at taking vault off because of shortening time during touching vault. ③ Increasing the horizontal and vertical velocities of CoG at taking vault made aerial motion high CoG and long aerial time during post-flight. ④ Increasing flight-height during post-flight caused hip joint angle to be large at maximal height, and then stable landing was performed due to CoG raised by way of the easy movement of aerial rotation. Therefore, it is concluded that these diagnoses might enhance the competitive performance of gymnast in Vault.

TlGaSe₂ : Ho 단결정의 광학적 특성

윤창선(C. S. Yoon),노정숙(J. S. Ro),정상조(S. J. Chung),진문석(M. S. Jin),박홍이(H. L. Park),송호준(H. J. Song),김화택(W. T. Kim) 한국진공학회(ASCT) 1995 Applied Science and Convergence Technology Vol.4 No.4

TlGaSe₂:Ho 결정에 대한 간접전이 에너지간격의 온도의존성은 각각 1차 상전이와 2차 상전이에 상당하는 100K와 108K에서 변칙특성을 보여주었다. TlGaSe₂:Ho 결정에서 Ho^(3+) 이온에 기인된 5^I_8→5^I_7과 5^I_8→5^F_5의 두 광학적 전이가 광흡수와 광전도도 스펙트라로부터 관측되었다. TlGaSe₂와 TiGaSe₂:Ho 결정의 열자극 전류로부터 고유결함과 Ho 불순물에 관련된 양공 덫을 발견하였다. The temperature dependence of the indirect energy gap of TlGaSe₂:Ho crystals showed anomalies at 100 K and 108 K corresponding to first-order and second-order phase transitions (PTI), respectively. Two optical transitions of 5^I_8→5^I_7 and 5^I_8→5^F_5 due to HO^(3+) ions are observed from optical absorption and photoconductivity spectra of TlGaSe₂:Ho crystals. From the thermally stimulated current (TSC) of TlGaSe₂ and TlGaSe₂:Ho crystals, hole traps related to the intrinsic defect and Ho impurity are observed.

도마 Tsukahara 몸 펴 720도 비틀기 동작의 오류 진단과 교정

윤창선 ( Chang Sun Yoon ),신형욱 ( Hyung Ook Shin ) 한국체육대학교 체육과학연구소 2014 스포츠사이언스 Vol.31 No.2

본 연구의 목적은 제 17회 아시아경기대회를 대비하여 훈련 중인 CJS 선수의 도마 Tsukahara 몸 펴 720도 비틀기 동작의 3차원 영상분석을 통하여 오류를 진단하고 교정방법을 제시함으로서 완벽한 연기를 구사할 수 있게 하는데 있다· 이를 위해 국가대표 1차선발전과 최종선발전에서 수행된 CJS 선수의 Tsukahara 몸 펴 720도 비틀기 동작을 분석하였다· 3차원 영상분석은 Sony PD-150 비디오카메라 2대를 이용하여 운동학적 변인을 분석한 결과 다음과 같은 결과를 얻었다· ① 발구름 국면동안 신체의 지지각도를 크게 하는 것은 구름판 이륙 시 신체중심의 수평성분을 수직성분으로의 전환이 용이할 뿐만 아니라제 1비약 체공시간을 짧게 하여 도마 착수를 빠르게 하는 것으로 나타났다· ② 도마 접촉국면 시 신체중심의 수평, 수직속도의 증가는 공중회전 시 높은 신체중심의 위치 확보와 체공시간을 길게 하여 원활한 공중회전이 이루어지는 것으로 나타났다· ③ 최대정점 시 고관절각을 크게 하는 것은 공중회전의 용이함과 안정된 착지동작을 유도하는 것으로 나타났다· The purpose of this study was to inform a national gymnast (CJS) who had trained error motions and correction methods of Tsukahara Stretch 2/1 Turn motion in Vault for improving competitive performance for 17th Asian Games· For this study, The Tsukahara Stretch 2/1 Turn motion of CJS had been diagnosed from 1st picking out-game, after his motion was corrected by means of information on correcting error motions· and then, it were dignosized from 2nd picking out-game with 3D image analysis· Two digital video cameras (Sony PD-150) used to capture images for 3D analysis· The results were as following; ① Supporting body-angle was large during board contact phase because the horizontal and vertical velocities of CoG was increased at taking off board and the shortening aerial time during pre-flight phase made touching vault rapid· ② Increasing the horizontal and vertical velocities of CoG at taking vault made aerial motion high CoG and long aerial time during post-flight· · Increasing flight-height during post-flight caused hip joint angle to be large at maximal height, and then stable landing was performed due to CoG raised by way of the easy movement of aerial rotation· Therefore, it is concluded that these diagnoses might enhance the competitive performance of gymnast in Vault·

평행봉 몸 접고 2회전 뒤 공중 돌아내리기 동작의 성공 요인

윤창선(Yoon Chang-Sun),하종규(Hah Chong-Ku) 한국체육과학회 2008 한국체육과학회지 Vol.17 No.2

The purpose of this study was to evaluate the success factors of the Double Salto Backward Piked Dismount in the parallel bar in gymnastics. For this study, 3 national male-gymnasts participated in this experiment. The two digital video cameras(Sony, PD-150) were used to record motions. Kwon3D 2.1 was used to process data and analyze for factors. The results were as follows: First, at down swing, a rapid vertical, horizontal velocity and angular velocity of hip joint made swing and vertical motion large, and then they were helpful to acquire a rotation effect and airborne height efficiently. At release, whip-swing was strong and rapid because at maximum hip extension small scapular angle cause them to swing down near body, that is, hip joint sustained large extension. Second, because a large scapular angle and a rapid angular velocity of hip joint by means of rapid vertical velocity made position high and whip-swing strong at release, they made the salto high and rotation efficient. Third, long spent time and a high vertical height of hip joint made room to rotate the Double Salto Backward Piked Dismount during airborne phase. A small angle of hip joint and a rapid vertical velocity made stable landing efficiently. In conclusion, success factors of the Double Salto Backward Piked Dismount were a small horizontal displacement, a high vertical displacement, the rapid velocity of rotation and the high vertical position during landing. Therefore, they produced stable airborne and landing motions.

기계체조 도마 동작의 도움닫기 구간이 경기력에 미치는 영향

윤창선 ( Yoon Changsun ),양태영 ( Yang Tae-young ),박상헌 ( Park Sangheon ),윤석훈 ( Yoon Sukhoon ) 한국체육대학교 체육과학연구소 2018 스포츠사이언스 Vol.36 No.1

본 연구의 목적은 기계체조 도마 동작의 도움닫기 구간이 경기력에 미치는 영향을 알아보는데 있다. 본 연구를 원활히 수행하기 위하여 K대학 체조선수 중 도마난도 기술 5.2 이상의 우수자 5명(age: 22.4±1.5 years, height: 165.2±2.9cm, weight: 61.2±4.1 kg, career: 12.0±2.5 years)과 그렇지 못한 비우수자 5명(age: 21.6±0.5 years, height: 162.8±3.6cm, weight: 57.4±3.2 kg, career: 10.0±2.1 years), 총 10명을 대상자로 선정하였다. 모든 대상자들은 도마의 로윤(LouYun) 기술을 각 5회씩 수행하였으며 이때 도움닫기 구간이 기계체조 도마 경기력에 미치는 영향을 알아보기 위하여 발구름 시간, 도마접촉시간, 도움닫기 시 속도, 운동량을 측정하였다. 연구 결과, 우수 그룹은 비우수 그룹 선수들과 비교하여, 통계적으로 유의하게 짧은 발구름 시간을 보였으며(p<.05), 도움닫기 시 약 9% 빠른 속도와 약 15% 높은 운동량을 나타냈다(p<.05). 또한, 통계적으로 유의한 차이는 나타나지 않았으나 0.01초 빠른 도마 접촉 시간을 나타냈다. 결론적으로, 이는 우수 그룹의 선수들이 비우수 그룹과 비교하여 폭발적으로 도움닫기와 발구름 연결동작 및 도마 접촉을 시도한다는 것을 의미하고, 빠른 도움닫기 속도와 운동량을 바탕으로 보다 높고 긴 체공시간의 난이도를 수행할 수 있는 잠재력을 지니고 있음을 나타낸다. 따라서 체조 도마선수들의 경기력을 향상시키기 위해는 도움닫기와 발구름을 성공적으로 수행하기 위한 상·하지의 근력 향상과 주로 주행 기술 등과 같은 도움닫기 구간의 숙련도를 높이기 위한 훈련이 매우 중요할 것으로 사료된다. The purpose of this study was to determine the effects approaching phase on vaulting in gymnastic performance. Ten gymnasts, divided into skilled group(age: 22.4±1.5 years, height: 165.2±2.9 cm, weight: 61.2±4.1 kg, career: 12.0±2.5 years) who performs vaulting skill level over than 5.2 points and less-skilled group(age: 21.6±0.5 years, height: 162.8±3.6 cm, weight: 57.4±3.2 kg, career: 10.0±2.1 years) who performs vaulting skill level less than 4.8 points, were participated in this study. Then, subjects were asked to perform the Lou Yun movement five times. The board contact, horse contact time, velocity and momentum of approaching phase were measured. In result, the board contact time in skilled group was significantly shorter than less-skilled group(p<.05). Moreover, the velocity and momentum of approaching phase in skilled group were greater than less-skilled group(p<.05). It indicates that skilled group performs more powerful contact than less-skilled group on the board. In addition, skilled group has a big potential for performing high level movements on vaulting with greater velocity and momentum compared with less-skilled group. Therefore, the training for running, approaching which could be step matching, and board contact are very important in order to enhance vaulting performance in gymnastics.

MATLAB/Simulink를 이용한 화력발전소 복수펌프 순환기동로직 시뮬레이션 구현

윤창선(Yoon, Chang-Sun),홍연찬(Hong, Yeon-Chan) 한국산학기술학회 2016 한국산학기술학회논문지 Vol.17 No.1

기존 국내 외 연구를 통해 개발된 펌프 운전 시뮬레이터는 대부분 동역학적 해석을 목적으로 하거나 운전자 교육용 을 목적으로 개발되어 왔다. 그런데 기존 시뮬레이터는 운전자 위주로 구성되어 있어서 로직 설계자나 시운전 참여자들이 다양한 운전조건 또는 로직을 임의로 변경하기에는 적절하지 않다. 더욱이 최근 발전소에서 사용되는 두 개 이상의 복수펌프 운전에 대해 설계자나 운전자가 쉽게 활용할 수 있는 시뮬레이터는 개발되어 있지 않다. 그래서 본 논문에서는 MATLAB Simulink를 사용하여 일반적인 화력발전소에 주로 사용되는 복수펌프 3대에 대한 순환운전 로직에 대해 설계자나 운전원이 쉽게 사용할 수 있도록 시뮬레이션을 할 수 있는 방법을 제안 한다. 이 제안은 MATLAB을 사용할 수 있는 사용자가 발전소 DCS(Distributed Control System) 로직에 주로 사용되는 ANSI/ISA S5.2를 Simulink를 통해 구현할 수 있도록 도움을 준다. 또한 코드에 명시된 로직을 구현하기 위해 블록에 대한 Sub-System을 만들고 이를 시뮬레이터 내에서 적용이 가능한지를 검증한다. 제안된 방법을 이용한 실무 검증 단계에서는 로직 내에서 발생한 기동신호를 구현된 펌프 모델에 적용하여 3대 펌프 순환운전 시 발생할 수 있는 모든 오류 가능성을 제안된 시뮬레이터를 사용하여 설계 단계 및 운전 전에 검증할 수 있음을 실험을 통해 확인하였다. The simulators for pump operation developed by domestic or overseas research have been developed for dynamic analysis or operator training purposes. However, previous developed simulators focused on the operators so they are unsuitable for logic designers or commissioning engineers who need to change the operation conditions or logics arbitrarily. In addition, the simulator for two or more condensate pumps' operation, which can be used easily by plant designers or operators, has not been developed. Accordingly, this paper suggests a simulation method that can be used easily for plant designers or operators using MATLAB Simulink. This suggestion helps users who can use MATLAB to implement ANSI/ISA S5.2, which is applied mainly for DCS (Distributed Control System). In addition, to implement the logics specified in the CODE, Sub-Systems were created for the block and evaluated to determine if they can be used in the simulator. In the working level stage using the suggested method, all error possibilities that might occur during the three pumps' rotation operation could be verified with the suggested simulator during the design stage or before operation.